This is the second time that I’ve come across a Flood Lagoon (the far-more-impressive first time was back on 20 June 2016 with the Carlton Foxhill Road Central Flood Prevention Lagoon. Thanks to lots of help provided on that First Contact, and after a phone call with Nav today (“my name is ‘Nav‘, like ‘SatNav’”) I’ve also got the inside skinny from Severn Trent on this one. And it is complicated…
There is a rectangle of grass (map) that encloses the whole thing:–
3 sides have a metre-high fence (map):–
The man-made structure that you can see in the centre of that photo above is two outlet pipes for a culvert that conducts surface water from the nearby estate’s roads into the soakaway:–
menu: Man Made|Man Made|Pipeline
(I was far less sure of using this one)
I’m much more confident of the mapping with the Soakaway basin (map) itself, which is a roundish depression within the centre of the rectangle:–
At the other corner opposite to the culvert outlets is a pumping station (map). This is the only item that Severn Trent actually had named (“Mapperley Lime Tree Gardens Pumping Station”):–
I’m unsure on this one, too. It is a rectangle of concrete surrounded by a 2m metal fence. That was easy to map. Then it has water-pumping equipment inside. Do I map that separate or together? In the end, I combined both sets of mapping. The works are designed to pump excess water out of the basin and into the nearby ditch.
menu: Man Made|Man Made|Water Works
The final items are a hedge + a ditch + an outfall pipe (map) within the ditch (using essentially the identical mapping for the culvert as above):–
I’ve made some small changes following the comment from lakedistrict:– the pumpingstation has been changed from
man_made=water works to
substance=wastewater. That does not form part of the JOSM menu system, but does fit better to this situation and is documented within the wiki.